40Cambrensis, Giraldus. The Topography of Ireland. (originally written in 1187) in The Historical Works of Giraldus Cambrensis, Thomas Wright, ed. London: George Bell and Sons, 1882. 134.
According to Bourke, Hayden, and Lynch: "Giraldus Cambrensis's account of the site is not particularly informative. He does not name Skellig Michael, but describes how a hollow stone situated outside a church miraculously produces wine for the celebration of the Eucharist each day. This miracle occurs 'in the south of Munster near Cork' on a 'certain island which has within it a church of Saint Michael, revered for its true holiness since ancient times' (O'Meara 1982, 80). Despite the dubious geography of the reference it is unlikely that any location other than Skellig Michael would fit the broader description; in addition, the miraculous tale recounted occurs in a later document, which definitely confirms Skellig Michael as the location." ((Bourke, Edward, Alan R. Hayden, Ann Lynch. Skellig Michael, Co. Kerry: the monastery and South Peak: Archaeological stratigraphic report: excavations 1986–2010. Rep. Dublin: Department of Environment, Heritage and Local Government: Office of Public Works, 2008. 23.)